Method of making fiber containers



Aug. 31 1926. 1,597,889

. E. F. HULBERT METHOD OF MAKING FIBER CONTAINERS Filed Dec. 1, 1924 1.1. w HIIIIIH m F .2.

' INVENTOR. 2M) /W ua/9Q? R 4 ATTORNEYJ' Patented Aug. 31, 192 6. v

-UNITED STATES .1,se1,eee

PATENT. omc-s.

nnwnw r. numnnr, or mnwauxnn, wrsconsm, nssmnon, in 1mm nearername, ToTHE unseen moxnen GOBPOBATIOH,-Ol' nmwmn im'rnon or MAKING rnannoonranmns.

Application niea December 1, 1924. Serial in. 753,105.

The invention relates to a method of making closures forfibercontainers, more .particularly those having tubular siding, whether ofcylindrical or polygonal cross section.

Heretofore it has been the practice in the making of container closuresto form the tubing or siding separately from the head and to attach thehead or closure member to said siding by bands, fasteners, or otherparts separate and distinct from the siding. The object of thisinvention is to provide a method by which the closure of the containeris formed in part by the siding itself and is easily and qulcklyproduced.

The invention further consists in the method and steps of the methodhereinafter set forth, and their equivalents.

In the drawings: Fig. 1 is asectional view showing the tubin in positionfor the first step of the metho Fig. 2 is a detail sectional view of thetubing after the first operation; Fig. 3 is a view of the apparatus withthe container parts in position for the second step of forming thecontainer; Fig. 4 is a view similar to Fig. 3 showing the second step,completed; Fig. 5 is a view similar to Fig. 4 showing the second stepcompleted where the container is not to be provided with a wear-band;Fig. 6 1s a view similar to Fig. 4 showing the second step completedwhere the outer edge of the container is of slightly different form. 0

In carrying out my process, fiber tubing 7, either of pressed pulp or ofa number of wrappings of paper or fiber sheets, and which may be ofeither cylindrical or polygonal shape in cross section, are placed in asuitable chuck 8 and held therein while one end is separated into innerand outer wall port-ions, preferably by cutting or splitting the sidingso that the inner wall may be turned down and inwardly to fornra closureflange 9 whose width and thickness may be varied to suit requirements.The splitting is done by any suitable tool and in the present instance,byway of illustration, I have shown a splitting knife or cutter 10having an annular serrated cutting edge 11 which, in the case ofcylindrical tubing, is revolved while it is advanced from the positionshown in Fig. 1 into the. tubing on its cutting stroke, thereby cuttingthe wall g heregf and bending it down as shown in After thetubing hasbeen split, as shown in Fig. 2, 1t may have a reinforcing wearband 12fitted to the outside thereof, as shown in Figs. 3 and 4, and placed ina suitable chuck 13 and u on a form 14, of a shape to conform Witht einner side of the tubing, with .an inner head member 15 against saidform and an outer,head member .16 placed in position within its outerend, said head members having a suitable coatmg of adhesive appliedthereto. With the parts of the container in the position shown in Fig. 3the head members 15 and 16 are pressed together and against the flange 9and at the same time the extended part of outer wall 17 of the tube,together with the nner edge of the band 12, are rolled over into crimpedengagement with the outer head j member. For this purpose the relativelystationary form 14 coo erates with a reciprocating plunger forme with aheadengaging part 18 and an edge-forming part 19 which have relativemovement b reason of springs 20 interposed between t e main body part ofthe plunger and the art 18. For crimping the edge of the container theedge 21 of the part 19 is preferably of a concave form. With thisapparatus, when the plunger is brought down upon the parts of thecontainer, the heads 15 and 16 and flange 9 are pressed together betweenthe plunger and the form 14 under considerable pres-- sure, therebyuniting these parts into a practically unitary structure which may havethe wear-band 12 crimped thereto at the same time or may have its outeredge 22 crimped as shown in Fi 5, or the ed eforming part 19 of the punger may be esigned to turn the outer edge 23 down upon the outer headmember, as shown in Fig. 6.

By the term siding in this specification I mean that portion of thecontainer forming the side wall or walls of the body or cover of acontainer.

What I claim as my invention is:--

1. That step in the method of making fiber containers which consists insplitting the siding at one end and turning in the inner wall portionthussplit from the siding to form a head-attaching portion.

2. The method of making fiber containers which consists in splitting anend portion of the siding into inner and outer wall portions, bending inthe inner wall portion thus split from the body, and securing inner and11 outer head members to said bent-in inner wall ortion.

3. he method of making fiber containers whichconsists in splittingan endportion of the siding into inner and outer wall portions, bending in theinner wall portion thus s lit from the body, securing inner and outeread members tosaid bent-in inner wall portion, and bending down theouter wall portion against the outer head member.

4. The method of making fiber containers which consists in splitting anend portion of the siding into inner and outer wall portions, bending inthe inner wall portion thus split from the body, securing inner andouter head members to said bent-in inner wall portion and bending downthe outer wall portion and a metal sheathing applied thereto against theouter head mem- 5. The method of making fiber containers wherein a headis secured to the siding between inner and outer head members whichconsists in splitting an end portion of the siding into inner and outerwall portions, bending in the inner wall portion from the body to form aclosure flange, positioning said head members adjacent said flangegluingsaid inner and outer head members together and to said flange underpressure,.and bending down the outer wall portion against the outer headmember.-

In testimony whereof, I aflix my signature.

EDWIN F. HULBERT.

